Sewing-machine attachment



J. COHEN.

SEWING MACHINE ATTACHMENT.

APPLICATION FILED Aue.s. 1920.

Patented July 26, 1921.

INVENTOR. Cola en ATTORNEY.

PATENT OFFICE.

JACOB COHEN, OF PHILADELPHIA, PENNSYLVANIA.

SEWING-MACHINE ATTACHMENT.

Application filed August 3. 1920.

To all whom it may concern Be it known that I, JACOB COHEN, a citizen ofthe United States, residing at Philadelphia, in the county ofPhiladelphla and State of Pennsylvania, have invented certain new anduseful Improvements in Sewing-Machine Attachments; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappcrtains to make and use the same.

The object of the invention is to provide a shear sharpening and bobbinwinding attachment for sewing machines adapted to be applied to any ofthe standard sewingmachines such as used by seamstresses, tallors andthe like and having means whereby it may be thrown into and out ofoperative relation with the driving belt of the machine, to facilitatethe dressing of shears and scissors and the winding of bobbins for usein the shuttle, etc., and with these objects in view the inventionconsists in a construction and combination of parts of which a preferredembodiment is shown in the drawing, wherein:

Figure 1 is a front view of the device applied in the operative positionto a sewing machine.

Fig. 2 is a side view of the same.

Fig. 3 is a sectional view taken parallel with the spindle of the emerydisk.

The device consists essentially of a spindle 10 mounted in inner andouter bearings 11 and 12 on a swinging bracket 13 which is pivotallymounted upon a base 14, said sp ndle being exposed and terminally freeat its outer end to form a bobbin arbor 15 and being fitted at its innerend with a grooved pulley 16 for contact with the driving belt 17 of thesewing machine which is indicated at 18. The spindle also carries anemery or abrading disk 19 preferably arranged adjacent to and parallelwith the drive pulley 16 and having its exterior surface exposed forfacilitating the arrangement of the shear or scissors blade in contacttherewith. Also the peripheral edge of the disk is exposed for the samepurpose.

Longitudinal movement of the spindle in the bearings of the swingingbrackets is prevented by a collar 20 and the portion of the spindlewhich constitutes the bobbin arbor is preferably split so as to exert byexpansion a frictional engagement with the bore of the bobbin which isindicated at 21, the slot in the arbor being indicated at 22.

Specification of Letters Patent.

Patented July 26', 1921.

Serial No. 401,023.

The base is preferably provided with an ear 23 upon which the swingingbracket is p voted and in the joint forming the connection between theswinging arm and said ear there is arranged a spring 24 for normallyholding the pulley out of contact with the drlving belt of the sewingmachine.

There is also employed a latch mechanism for holding the device in itsoperative position, that is with the pulley in engagement with the beltof the sewing machine, and in the construction illustrated thismechanism includes a standard 25 rising from the base and havingpivotally mounted thereon 'a latch 26 provided with a lug 26 forengagement with a tongue 27 on the swinging bracket, as will be seen byreference to Fig. 2 of the drawing.

The engagement of the latch with the tongue 27 retains the attachment inits operative position and when the latch'is moved out of engagementwith the tongue the spring moves the attachment into and holds it ininoperative position.

Having thus described the invention, what I claim is:

1. An attachment of the class described having a tool, a pulleyapplicable to a driving medium, a shaft mounting the tool and extendingfrom the pulley, a base, a bracket bearing for the shaft pivoted on thebase, means to urge the bracket bearing away from said medium, and alatch means on said base cooperating with the bracket bearing tomaintain the pulley in engagement with said medium against the urgencyof said means.

2. An attachment of the class described having a base, a bracket bearingpivoted thereon, a shaft in said bracket bearing, a drive pulley on theshaft to engage a power medium, a tool 011 the shaft between the pulleyand the adjacent end of the bracket bearing, means to secure the shaftagainst displacement upon the bracket bearing at the end opposite thepulley, a lug on the bracket bearing, a lever pivoted to the base havinga lug engageable with said lug to maintain the pulley in engagement withsaid medium, and a spring connected to the base and bracket bearing tourge the latter away from the medium.

In testimony whereof I affix my signature in presence of two witnesses.

JACOB COHEN.

Witnesses:

SAM KAPLON, LOUIS BLUMENTHAL.

